Getting so high to where you feel like you're in a cartoon.
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Toon toon is a person that is considered to be half-witted and deprived of common sense. It's a person that is generally only capable of handling trivial tasks at best, but believes they are worthy of higher status and capable of achieving more. Common behavior of Toon Toons result in immediate failure or embarassment. Actions of Toon Toons create widespread humiliation and have negative effects on those close to them.

The most annoying thing you can ever call one of your video game characters, often used in World of Warcraft by tools.

The term retards use to describe that they have an alt or a character on a mmorpg. You know how STUPID TOON sounds? Jesus...

Toon, usually referred as a character in an online role playing game. Also known as an alt, or character.

Or, something an idiot would say

The word, which if uttered, will cause a cruise ship to pass by.

the word "town" spoken in a geordie accent sounds like the slang term "toon." newcastle's football (soccer) fans are known as the "toon army" - this led to a sky sports presenter being fired recently for using a shockingly poor taste pun on "tsunami" which i'll not repeat here.